Patents by Inventor Wataru Kurokawa

Wataru Kurokawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10934629
    Abstract: Provided is a surface-treated steel sheet with a compound layer containing F and composed essentially or Zr at least on one surface thereof, wherein the Zr amount is 80 to 350 mg/m2 and the F amount is 0.5 to 10 mg/m2 within the layer, and an organic resin coated metal container manufactured using the surface-treated steel sheet. The surface-treated steel sheet of the present invention is manufactured through forming a layer having the Zr amount of 80 to 350 mg/m2 at least on one surface of a steel sheet by cathode electrolytic treatment in an aqueous solution containing a Zr ion and F ion, and subsequently adjusting the surface to control the F amount to 0.5 to 10 mg/m2 by one or more treatments selected from immersion and spraying with an ion-containing aqueous solution and cathode electrolytic treatment in the ion-containing aqueous solution.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: March 2, 2021
    Assignee: TOYO KOHAN CO., LTD.
    Inventors: Kunihiro Yoshimura, Naomi Taguchi, Satoko Fukutomi, Wataru Kurokawa, Munemitsu Hirotsu, Mitsuhide Aihara, Satoshi Mikami
  • Patent number: 10858751
    Abstract: A surface-treated steel sheet for cans forming a coating of a compound containing chiefly Zr and containing F, the amount of Zr being 80 to 200 mg/m2 and the amount of F being not less than 12 mg/m2 in the coating on the surface that becomes the outer surface side of the can. The surface-treated steel sheet is capable of effectively preventing the resin coating from peeling on the outer surface side of the can at dented portions.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: December 8, 2020
    Assignees: TOYO SEIKAN CO., LTD., TOYO KOHAN CO., LTD.
    Inventors: Mitsuhide Aihara, Wataru Kurokawa, Munemitsu Hirotsu, Kunihiro Yoshimura, Satoko Harada, Kousuke Sasaki, Masahiko Matsukawa, Miwa Uchikawa, Keisuke Yoshida
  • Publication number: 20200332419
    Abstract: The object of the present invention is achieved by a surface treatment agent to be used for surface treatment of an aluminum alloy material for forming cans, which includes zirconium, aluminum, a nitrate radical, and fluorine, wherein the pH ranges from 2.0 to 4.0, the molar mass concentration of the zirconium ranges from 3.2 mmol/kg to 33.0 mmol/kg, the molar mass concentration of the aluminum ranges from 14.8 mmol/kg to 74.1 mmol/kg, the molar mass concentration of the nitrate radical ranges from 16.1 mmol/kg to 161.4 mmol/kg, the molar mass concentration of the fluorine ranges from 52.6 mmol/kg to 526.3 mmol/kg, (F?6Zr)/Al?2.5 is satisfied (wherein, F represents the molar mass concentration of the fluorine, Zr represents the molar mass concentration of the zirconium, and Al represents the molar mass concentration of the aluminum, and substantially no phosphorus compound is contained.
    Type: Application
    Filed: October 11, 2018
    Publication date: October 22, 2020
    Inventors: Akio Shimizu, Akinobu Tsuneishi, Shoichi Naruse, Ryohei Kikuchi, Wataru Kurokawa, Yuuji Funagi, Noriyoshi Obara, Shuji Nakano
  • Patent number: 10309028
    Abstract: Provided is a method for producing a surface-treated steel sheet including the step of forming a layer mainly composed of an oxygen compound containing Al onto a tin-plated steel sheet by conducting cathode electrolytic treatment to the tin-plated steel sheet using an electrolytic treatment solution containing Al ions and nitrate ions. For the electrolytic treatment solution, an electrolytic treatment solution not containing F ions and where the amount of nitrate ions contained is 11,500 to 25,000 ppm by weight is used.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: June 4, 2019
    Assignees: TOYO KOHAN CO., LTD., TOYO SEIKAN CO., LTD.
    Inventors: Kunihiro Yoshimura, Masanobu Matsubara, Marie Sasaki, Masahiko Matsukawa, Keisuke Yoshida, Wataru Kurokawa, Munemitsu Hirotsu, Mitsuhide Aihara
  • Patent number: 10000858
    Abstract: To provide a bath for surface treatment capable of forming a surface-treating film having excellent corrosion resistance by a high-speed electrolytic treatment, and a method of producing a surface-treated steel plate having excellent corrosion resistance and closely adhering property to the coating maintaining good productivity. A bath for surface treatment used for forming a surface-treating film on the surface of a steel plate by cathodic electrolysis, the bath for surface treatment containing Zr and/or Ti, and a polycarboxylic acid.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: June 19, 2018
    Assignees: TOYO SEIKAN GROUP HOLDINGS, LTD., NIPPON PAINT SURF CHEMICALS CO., LTD., TOYO KOHAN CO., LTD.
    Inventors: Wataru Kurokawa, Seitaro Kanazawa, Shinichi Taya, Kunihiro Yoshimura, Naomi Iida, Miwa Iida, Masahiko Matsukawa
  • Publication number: 20170342584
    Abstract: Provided is a surface-treated steel sheet with a compound layer containing F and composed essentially or Zr at least on one surface thereof, wherein the Zr amount is 80 to 350 mg/m2 and the F amount is 0.5 to 10 mg/m2 within the layer, and an organic resin coated metal container manufactured using the surface-treated steel sheet. The surface-treated steel sheet of the present invention is manufactured through forming a layer having the Zr amount of 80 to 350 mg/m2 at least on one surface of a steel sheet by cathode electrolytic treatment in an aqueous solution containing a Zr ion and F ion, and subsequently adjusting the surface to control the F amount to 0.5 to 10 mg/m2 by one or more treatments selected from immersion and spraying with an ion-containing aqueous solution and cathode electrolytic treatment in the ion-containing aqueous solution.
    Type: Application
    Filed: August 16, 2017
    Publication date: November 30, 2017
    Inventors: Kunihiro YOSHIMURA, Naomi TAGUCHI, Satoko FUKUTOMI, Wataru KUROKAWA, Munemitsu HIROTSU, Mitsuhide AIHARA, Satoshi MIKAMI
  • Publication number: 20170253985
    Abstract: A surface-treated steel sheet for cans forming a coating of a compound containing chiefly Zr and containing F, the amount of Zr being 80 to 200 mg/m2 and the amount of F being not less than 12 mg/m2 in the coating on the surface that becomes the outer surface side of the can. The surface-treated steel sheet is capable of effectively preventing the resin coating from peeling on the outer surface side of the can at dented portions.
    Type: Application
    Filed: March 11, 2015
    Publication date: September 7, 2017
    Applicants: Toyo Seikan Co., Ltd., TOYO KOHAN CO., LTD.
    Inventors: Mitsuhide AIHARA, Wataru KUROKAWA, Munemitsu HIROTSU, Kunihiro YOSHIMURA, Satoko HARADA, Kousuke SASAKI, Masahiko MATSUKAWA, Miwa UCHIKAWA, Keisuke YOSHIDA
  • Publication number: 20160289843
    Abstract: A surface-treated steel sheet and a process for its production. The surface-treated steel sheet has, on at least one surface of the steel sheet, a surface-treating layer that chiefly comprises zirconium and oxygen, and contains fluorine, the surface-treating layer containing an element of the Group II on the surface side thereof. The surface-treated steel sheet features excellent adhesion to the organic resin coating, excellent corrosion resistance, and can provide metal cans that feature excellent adhesion to the resin on the inner and outer surfaces of the cans and excellent resistance against the elution of fluorine.
    Type: Application
    Filed: December 5, 2014
    Publication date: October 6, 2016
    Applicants: TOYO SEIKAN CO., LTD., TOYO KOHAN CO., LTD., NIPPON PAINT SURF CHEMICALS CO., LTD.
    Inventors: Wataru Kurokawa, Munemitsu Hirotsu, Mitsuhide Aihara, Masahiko Matsukawa, Miwa Uchikawa
  • Publication number: 20160265134
    Abstract: Provided is a method for producing a surface-treated steel sheet including the step of forming a layer mainly composed of an oxygen compound containing Al onto a tin-plated steel sheet by conducting cathode electrolytic treatment to the tin-plated steel sheet using an electrolytic treatment solution containing Al ions and nitrate ions. For the electrolytic treatment solution, an electrolytic treatment solution not containing F ions and where the amount of nitrate ions contained is 11,500 to 25,000 ppm by weight is used.
    Type: Application
    Filed: August 20, 2014
    Publication date: September 15, 2016
    Inventors: Kunihiro YOSHIMURA, Masanobu MATSUBARA, Marie SASAKI, Masahiko MATSUKAWA, Keisuke YOSHIDA, Wataru KUROKAWA, Munemitsu HIROTSU, Mitsuhide AIHARA
  • Publication number: 20160230301
    Abstract: Provided is a surface-treated steel sheet with a compound layer containing F and composed essentially or Zr at least on one surface thereof, wherein the Zr amount is 80 to 350 mg/m2 and the F amount is 0.5 to 10 mg/m2 within the layer, and an organic resin coated metal container manufactured using the surface-treated steel sheet. The surface-treated steel sheet of the present invention is manufactured through forming a layer having the Zr amount of 80 to 350 mg/m2 at least on one surface of a steel sheet by cathode electrolytic treatment in an aqueous solution containing a Zr ion and F ion, and subsequently adjusting the surface to control the F amount to 0.5 to 10 mg/m2 by one or more treatments selected from immersion and spraying with an ion-containing aqueous solution and cathode electrolytic treatment in the ion-containing aqueous solution.
    Type: Application
    Filed: August 4, 2014
    Publication date: August 11, 2016
    Applicants: Toyo Kohan Co., Ltd., Toyo Seikan Group Holdings, Ltd
    Inventors: Kunihiro YOSHIMURA, Naomi TAGUCHI, Satoko FUKUTOMI, Wataru KUROKAWA, Munemitsu HIROTSU, Mitsuhide AIHARA, Satoshi MIKAMI
  • Publication number: 20160002809
    Abstract: A method of producing a surface-treated steel sheet is provided. The method has a step of performing electrolytic treatment thereby to form a layer including a metal-oxygen compound on a surface of a steel sheet. The electrolytic treatment is performed so that the steel sheet is continuously fed into electrolytic treatment baths each including a treatment liquid and an electrode. The treatment liquid contains metal ions.
    Type: Application
    Filed: January 30, 2014
    Publication date: January 7, 2016
    Applicants: TOYO KOHAN CO., LTD., TOYO SEIKAN GROUP HOLDINGS, LTD.
    Inventors: Kunihiro YOSHIMURA, Naomi TAGUCHI, Satoko FUKUTOMI, Wataru KUROKAWA, Munemitsu HIROTSU, Seitaro KANAZAWA
  • Publication number: 20150129453
    Abstract: A surface treatment agent composition for non-chromium steel sheets for removing iron ions without reducing the amount of aluminum ions when subjecting the steel sheet to surface treatment by means of cathodic electrolysis using a surface treatment agent containing aluminum ions as the main component; and a method for producing a surface-treated steel sheet using the composition. A surface-treated steel sheet exhibiting high corrosion resistance, a surface-treated steel sheet with an organic coating, and a can lid, can body and seamless can produced using the surface-treated steel sheets. A surface treatment agent composition for steel sheets contains aluminum ions, fluorine ions and polycarboxylic acid and is used as the surface treatment bath used for forming a surface treatment coating film on the surface of the steel sheet by cathodic electrolysis.
    Type: Application
    Filed: March 22, 2012
    Publication date: May 14, 2015
    Applicants: Nippon Paint Co., Ltd., Toyo Kohan Co., Ltd., Toyo Seikan Kaisha, Ltd.
    Inventors: Miwa Uchikawa, Masahiko Matsukawa, Tomio Hirano, Wataru Kurokawa, Munemitsu Hirotsu, Seitaro Kanazawa, Kunihiro Yoshimura, Shinichi Taya, Naomi Taguchi
  • Publication number: 20140332397
    Abstract: To provide a bath for surface treatment capable of forming a surface-treating film having excellent corrosion resistance by a high-speed electrolytic treatment, and a method of producing a surface-treated steel plate having excellent corrosion resistance and closely adhering property to the coating maintaining good productivity. A bath for surface treatment used for forming a surface-treating film on the surface of a steel plate by cathodic electrolysis, the bath for surface treatment containing Zr and/or Ti, and a polycarboxylic acid.
    Type: Application
    Filed: July 23, 2014
    Publication date: November 13, 2014
    Applicants: TOYO SEIKAN GROUP HOLDINGS, LTD., TOYO KOHAN CO., LTD., NIPPON PAINT CO., LTD.
    Inventors: Wataru KUROKAWA, Seitaro KANAZAWA, Shinichi TAYA, Kunihiro YOSHIMURA, Naomi IIDA, Miwa IIDA, Masahiko MATSUKAWA
  • Patent number: 8822037
    Abstract: A surface-treated steel plate obtained by forming, on at least one surface of the steel plate by cathodic electrolysis, a surface-treating film which contains a mixed oxide of an oxide of Fe and at least one of an oxide of Zr or an oxide of Ti, and a polycarboxylic acid, the amount of Zr or Ti, or the total amount of Zr and Ti if both of them are present, being from 3 to 300 mg/m2 and the amount of C being from 0.1 to 5.0 mg/m2.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: September 2, 2014
    Assignees: Toyo Seikan Group Holdings, Ltd., Toyo Kohan Co., Ltd.
    Inventors: Wataru Kurokawa, Seitaro Kanazawa, Shinichi Taya, Kunihiro Yoshimura, Naomi Iida, Miwa Iida, Masahiko Matsukawa
  • Patent number: 8551317
    Abstract: Disclosed are a method and an apparatus for forming an oxide coating film with excellent corrosion resistance and adhesiveness on a cathode made of a metal plate by a simple process at low cost. A direct current voltage is applied between an anode (12) and a cathode (13) in an electrolyte solution which cathode (13) is made of a metal plate to be coated with oxide and arranged opposite to the anode (12), while supplying oxygen or a gas containing oxygen into the electrolyte solution, so that the metal plate cathode (13) is coated with oxide, thereby being formed into a oxide-coated metal plate.
    Type: Grant
    Filed: November 9, 2004
    Date of Patent: October 8, 2013
    Assignees: Toyo Seikan Kaisha, Ltd., Toyo Kohan Co., Ltd.
    Inventors: Wataru Kurokawa, Hiroshi Matsubayashi, Mitsuhide Aihara, Masanobu Matsubara, Masatoki Ishida, Norimasa Maida
  • Publication number: 20130052478
    Abstract: [Problems] To provide a bath for surface treatment capable of forming a surface-treating film having excellent corrosion resistance by a high-speed electrolytic treatment, and a method of producing a surface-treated steel plate having excellent corrosion resistance and closely adhering property to the coating maintaining good productivity. [Means for Solution] A bath for surface treatment used for forming a surface-treating film on the surface of a steel plate by cathodic electrolysis, the bath for surface treatment containing Zr and/or Ti, and a polycarboxylic acid.
    Type: Application
    Filed: May 27, 2011
    Publication date: February 28, 2013
    Applicants: TOYO SEIKAN KAISHA, LTD., TOYO KOHAN CO., LTD., NIPPON PAINT CO., LTD.
    Inventors: Wataru Kurokawa, Seitaro Kanazawa, Shinichi Taya, Kunihiro Yoshimura, Naomi Iida, Miwa Iida, Masahiko Matsukawa
  • Publication number: 20120222963
    Abstract: A surface-treated metal material having, formed on the surface of a metal base member, an inorganic surface-treating layer that contains inorganic components or, further having an organic surface-treating layer formed on the inorganic surface-treating layer, the inorganic surface-treating layer containing at least M (M is at least one of Ti, Zr and Al), O and F. The organic surface-treating layer contains a silane coupling agent containing Si in an amount of 0.8 to 30 mg/m2 or a phenol-type water-soluble organic compound.
    Type: Application
    Filed: May 1, 2012
    Publication date: September 6, 2012
    Applicants: TOYO KOHAN CO., LTD., TOYO SEIKAN KAISHA, LTD.
    Inventors: Masatoshi ISHIDA, Norimasa MAIDA, Wataru KUROKAWA, Hiroshi MATSUBAYASHI, Mitsuhide AIHARA, Shigeya TAKAHASHI, Masanobu MATSUBARA
  • Patent number: 8075991
    Abstract: A stainless steel material for a fuel cell, used for a fuel cell or a cartridge for the fuel cell, having a magnetic permeability of 1.000 to 2.500, and forming a layer having a value of chromium atomic %/iron atomic % of not less than 3.0 in the most surface thereof, and/or the layer of thickness of not less than 12 nm calculated as SiO2 having an oxygen atomic % of not less than 20%. Even when brought into contact with the content solution exhibiting acidity of the fuel cell, the stainless steel material reliably suppresses the elution of metal ions thereof.
    Type: Grant
    Filed: August 9, 2007
    Date of Patent: December 13, 2011
    Assignee: Toyo Seikan Kaisha, Ltd.
    Inventors: Kouki Kinouchi, Wataru Kurokawa, Shouzou Shintani, Kinuyo Shintani, legal representative, Daisuke Imoda, Kenji Yoshihiro, You Yamamori
  • Patent number: 7938950
    Abstract: A method of treating surfaces of a steel plate by forming an inorganic film on the surfaces of the steel plate by cathodic electrolytic treatment in an aqueous solution containing Zr and F and not containing phosphoric acid ions. Also disclosed is a method of treating surfaces of a steel plate by cathodic electrolytic treatment in aqueous solution containing Zr, F and P, and having a phosphoric acid ion concentration in a range of larger than 0 to smaller than 0.003 mols/liter calculated as PO4.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: May 10, 2011
    Assignee: Toyo Seikan Kaisha, Ltd.
    Inventors: Wataru Kurokawa, Mitsuhide Aihara
  • Publication number: 20100320216
    Abstract: A surface-treated tin-plated steel sheet for welded cans forming a surface-treating layer comprising chiefly a silane coupling agent on the surface of a tin-plated layer formed on the surface of a steel sheet, wherein the amount of free tin (Sn) (X g/m2) in the tin-plated layer and the amount of silicon (Si) (Y mg/m2) in the surface-treating layer lie in ranges satisfying all of the following formulas, 0.2?X?13, Y?1.0, Y?1.58X+6.92 and Y??0.36X+10.70. Despite of a non-chromium surface treatment, the surface-treated tin-plated steel sheet features excellent weldability, particularly high-speed weldability, close adhesion during the working and excellent corrosion resistance.
    Type: Application
    Filed: August 6, 2008
    Publication date: December 23, 2010
    Applicants: TOYO SEIKAN KAISHA, LTD., TOYO KOHAN CO., LTD.
    Inventors: Wataru Kurokawa, Yumi Yoshimura, Yasufumi Tadaki, Masanobu Matsubara